Hydraulic feed mechanism for radial drill spindles



May 6, `ISO. R. R. ROBERTS ETAL' Filed Jfy 26, i928 HYDRAULIC FEED M-ECHANISM FOR'RDIAL DRILL SPIDLES 4 Sheets-Sheet l heirATToRN-EY My 5, 1930. R. R. ROBERTS 'ET AL HYDRAULIC' FEED MECHANISM lFDR RADIAL DRILL SPINDLEs Filed July 26, 1928 4 sheets-sheet 2 INVENToRs mrhyJFFormd Rogzzssellfaber May 6, 1930*' R.. R. ROBERTS ET AL HYDRAULIC FEED MECHANlSM FOR- RADIAL DRILL SPINDLES Filed July 2e", 1928 '4' sheets-sheet 3 llll hez'rAn oRNEY May 6, 1930. R. R. RoBER-rs ET AL HYDRAULIC FEED MECHANISM FOR DIAL DRILL SPINDLES Filed July 26, 1928 Lllllllllllllllllllllll I lNvE Rsl Mrz/@Jbrmd A Raid? sseZZRobers' 23a Y lez'rATToRNl-:Y

'Patented May e, 1930 UNITED STATES PATENT OFFICE ROLAND RUssELL ROBERTS AND WORTHY J. E. FORWARD, OE' ROCHESTER, NEW YORK, AssIGNORs To CONSOLIDATED MACHINE Toor.. CORPORATION OE AMERICA,

OE ROCHESTERNEW YORK, A CORPORATION OE DELAWARE HYDRAULIC FEED FOR RADIAL DRILL SPINDLES Application led July 26, 1928. Serial No. 2956L This invention relates to improvements in machine tools, and more particularly to the class of machines employing a rotating tool spindle, andhas for an objectto afford a simplified, practicable, and eilicient mechanism for feeding such a tool spindle by fluid pressure means.

In a more particular aspect, the invention has for its object to afford a construction and 10 arrangement requiring a minimum number of pressure Operatedjpiston and cylinder, so as to impart the necessary feeding movements to the tool spindle in an eliicient manner and with a structure of simple and -`convenient design that gives proper support to the tool spindle.

To these and other ends the invention comprehends the structure and arrangement of ssi "i parts that will appear clearly from the folf lowin description when read in conjunction with t e accompanying drawings, the novel 3o features being pointed out in the claims-following the description.

In the drawings: f Figure l is a side elevation of a radial drill incorporating a preferred embodiment of the invention;

Figure 2 is a plan view, with parts removed and partially in section, the rail and'tool head being swung around with relation to the support;

Figure 3 is an enlarged side elevation with parts broken away, showing the fluid pressure cylinder and carrier sleeve partially in section;

Figure 4 1s an enlarged end elevation, partially section on line 4--4 of Figure 3,

showing the .tool spindle in lowered position, the pressure cylinder, and controlling parts;

Figure 5 is a similar view with the toolspindle elevated to its uppermost position in the carrier sleeve; l

Figure 6 is a. horizontal sectional view on line 6-6 of Figure 5;

Figure 7 is a plan view of the tool spindle carrierv and associated parts:

Figure 8 is a sectional view taken approximately on line 8-8 of Figure 2;

Figure 9 Vis a sectional view taken approxi- Y mately-on line 9-9 of Figure 8, and

Figure 10 is a sectional view taken approxi- K mately on line 10-10 of Figure 8.

The invention is susceptible of application in a variety Ofways and to machine tools of diiferent general types, and for convenience of illustration. it is disclosed in this a'pplication as adapted to a radial drill that Includes a column or supporting standard 1, upon which is vertically adjustable a bracket 2, while 3 is a horizontal rail' or arm pivotally mounted within the bracket 2.

The bracket 2 includes Overhanging flanges or plates 4 cooperating with vertical guides 5, see Figures 1 and 2, and is adjustable vertically with reference to the supporting column 1 by means of a motor 6 through a screw and nut or other suitable gearing which forms no essential part of the invention herein and is therefore unnecessary to disclose in detail. The rail 3 is held in its adjusted radial position on bracket 2 by a suitable lock controlled by a bell crank 7 and operating lrod 8, the latter being governed by fluid pressure through a cylinder 9 and pipes 10, such iiuid pressure operation being regulated by a-valve, operated from a rod 11 which carries a controlling handle 12. Mounted for horizontal adjustment on the rail 3 is a tool head;` the construction and operation of which will now be described.

21 designates tracks,

while 22 is a main so supporting plate forming part of the tool head and adjustable on said tracks. Refer-4 ring to Figures 3 to 5 inclusive, 23 designates a fluid pressurecylinder clamped tothe plate -22 by means ofv bolts 24 or other suitable attaching means, while 25 and 26 designate 4 stuffing boxes at the bottom and top of said cylinder for a purpose now to be made clear.

' Extending through said cylinder and movable endwise thereof is a carrier, preferably in the form of a sleeve and including a lower piston portion 27 provided with' a piston 28 movable in said cylinder, and an upper portion 29 extending above the cylinder and rigidly connected to the lower portion 27 by threading or otherwise. The sleeve or carrier just described is movable endwise of the cylinder through the stuffing boxes 25 and 26 from the position shown in Figure 4` to that shown in Figure 5 in order to feed the tool spindle, which latter extends through the cylinder and sleeve already described and is surrounded thereby, in order to afford a simplied and economical structure as well as one that is suiiiciently rigid'to give proper support and bearing to the tool spindle, and

to house the parts within a minimum space.,

31 designates the tool spindle that is journalled as shown within the sleeve-like carrier and movable endwise therewith when the latter is operated in one direction or' the other, by the introduction of fluid pressure into one end of the cylinder 23. The tool spindle 31 is rotatable within its carrier, and to this end carries at its upper end a spur gear'32 engaged and driven by a spurgear 33 that is slidably keyed to the driven shaft 34. The gears 32 and 33 are enclosed within a suitable housing 35 at the top of the spindle` assembly is movable endwise of the driving shaft 38 to permit adjustment alongthe rail 3. The driving shaft 38 carries a pulley 39 that is operated through suitable belts from a pulley 40 on the armature shaft of an electric driving motor 41, which furnishes the necessary power to the parts on the'tool head just described. The driven shaft 34'is arranged within a suitable vertically disposed housing that is provided with vertical tracks 42, see Figure 7, engaged by overhanging flanges or plates 43 secured to the tool spindle carrier, thereby insuring a sin/00th balanced control of the tool spindle as it isfed vertically.

In order to effect the necessary movement of piston 28 within the' cylinder 23, the stuffing boxes'or cylinder heads 25 and26 are provided with openings 51 and 52 respectively, see Figure 3, to which fluid or hydraulic pressure is conducted from a pump indicated generally at 53, and mounted on plate 22, power to the pump being furnished from the-aforementioned driving shaft 38 through pulleys 54 and 55 and the interconnecting belts. The operation of the pump 53 and control of fluid pressure to the cylinder 23 is effected by the hand lever 56, such controlling mechanism as well as the construction of the iuidpressure pump being of conventional form known in the art of fluid pressure controlling mechanisms, and further disclosure of such parts is considered unnecessary for an understanding of the present invention, which has to do with the structure by which fluid pressure control is operatively associated with a rotating tool spindle of a machine tool. c -In order to effect the necessary lateral ad- ]ustment of the tool head along the tracks 21, a rack 61 is provided at the underside of the upper track 21, see Figures 1, 44and 8, and 62 is a spur gear engaging said rack and formed on an arbor 62 that is` provided at its opposite end with a worm gear'63 driven' bya worm 64 on shaft 65. The latter carries a clutch .designated generally at 66 which is shiftable so as to operatethe shaft 65 from either one o f the bevel gears 67 which are moved in opposite directions from a bevel gear 68 on shaft 69. The shaft 69 is operated constantly from the driving shaft 38 through bevel gears 70 and 71, see Figure 2, gear 70 beingI slidably keyed on the shaft 38.

The clutch 66 is controlled by a clutch shifter 72 that is fixed on a rocker arm 73, see Figures 8 and 9, the latter being shiftable upon operation of the hand lever 74. It willv be understood that normally the clutch 66 is disengaged from gears 67, and is brought into lengagement with one or the other of said' gears by operating hand lever 74 when it is desired to shift the tool head horizontally along the rail 3 to change the position of the tool with reference to the Work.

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While the invention has been described in is movable by fiuid pressure to. move the sleeve and the spindle, a driven shaft rela-y tivel to which the spindle moves, V-a. ear rotate by the driven shaft and x to the spindle for driving the same. an arm, guideways on said arm arranged transversely to 5 the feed movement of the spindle, a drive shaft arran d parallel with s aid guideways guides on t e carrier slidably engaging said guideways, and gearing supported by the carrier and movable longitudinall)1 of said' drive 10 shaft for establishingt operative connection between the drive sha and the driven shaft. Y In witness whereof, we have hereunto signed our names.

, ROLAND RUSSELL ROBERTS. 15 WORTHY J. F. FORWARD. l 

